workbox.routing.registerRoute(
  new RegExp('xy/xyzAPI/api'),
  workbox.strategies.staleWhileRevalidate({
    cacheName: 'api-url',
    plugins: [
      new workbox.expiration.Plugin({
        maxEntries: 20,
        maxAgeSeconds: 24 * 60 * 60
      }),
      new workbox.broadcastUpdate.Plugin('api-url', {
        headersToCheck: ['date'],
      })
    ]
  }));